Fix consts and duplicated comment

Author: electriclilies

include/tvm/ir/expr.h

@@ -182,8 +182,6 @@ class RelayExprNode : public BaseExprNode {
    *
    * Set to VirtualDevice::FullyUnconstrained by default.
    *
-   * Set to VirtualDevice::FullyUnconstrained by default.
-   *
    * \note Unfortunately, the type of virtual_device_ needs to be ObjectRef to avoid a circular
    * import.
    */

src/relay/ir/expr.cc

@@ -45,6 +45,7 @@ using namespace tvm::runtime;
 Constant::Constant(runtime::NDArray data, Span span) {
   ObjectPtr<ConstantNode> n = make_object<ConstantNode>();
   n->data = std::move(data);
+  n->virtual_device_ = VirtualDevice::FullyUnconstrained();
   n->span = std::move(span);
   data_ = std::move(n);
 }